I too have a power strip but it's not so smart as your "spike guard", has only one light.
It alerted me to a problem which the GE tester showed to be reversed L-N.
Yours appears to have multiple lights so, perhaps it does everything my little GE tester does.
I keep one of those testers in my toolbox. Friends often ask for help with electrical problems and it's come in handy quite often.
Just a couple bucks more gets one with a pushbutton that tests GFCI breakers by allowing a trickle of ground current.
For the uninitiated, reason i harp on fixing the outlet is this:
In this US style (Edison) lamp socket
the metal tab(s) at bottom are switched to what should be the "hot" wire L
and the threaded barrel should be connected directly to the "neutral" wire N , with no switch in between.
Observe that while changing a light bulb
the threaded base makes contact with the threaded barrel long before the bulb bottoms out in the socket
meaning your fingers will likely touch those threads while changing the bulb.
If those threads are connected to N, no problem
but if they're connected to L , Ouch !
I worry about children's little hands getting disfigured .
That's why in US lamps
the lamp socket is wired with its threaded barrel connected to the conductor in the lampcord that's marked with a small rib
and the ribbed conductor goes to the wider of the two prongs on the plug
http://www.whatsontheare.com/wp-content/uploads/2011/11/building-design-and-construction-systems-plugs-outlets-2.jpg
which will only fit into the wider slot in the outlet which should be N
In my part of the country there are lots of older houses with electrical troubles.
This link describes troubles with outdated wiring.
http://inspectapedia.com/electric/Old_House_Wiring.htm
observe the lamp's switch is in the wire to center button
so if L is connected to threaded barrel, it'll shock you even when switch is OFF.
Home handymen must be aware of these practical matters.
Students of physics are naturally curious so will be getting their hands into electrical systems. It is good for them too.
old jim